| Form N-CSR Cover | 6 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Legg Mason Partners Income Trust |
| Entity Central Index Key | 0000764624 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 6 Months Ended | |
| May 31, 2024 USD ($) $ / shares | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Legg Mason Partners Income Trust | |
| Entity Central Index Key | 0000764624 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | May 31, 2024 | |
| Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Intermediate Maturity New York Municipals Fund | |
| Class Name | Class A | |
| Trading Symbol | IMNYX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at 877-6LM-FUND/656-3863 . | |
| Additional Information Phone Number | 877-6LM-FUND/656-3863 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of $10,000 investment Costs paid as a percentage of a $10,000 investment †, * Class A $40 0.79% | [1],[2] |
| Expenses Paid, Amount | $ 40 | |
| Expense Ratio, Percent | 0.79% | |
| Net Assets | $ 144,200,028 | |
| Holdings Count | $ / shares | 105 | [3] |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of May 31, 2024) Total Net Assets $144,200,028 Total Number of Portfolio Holdings * 105 Portfolio Turnover Rate 0% | [3] |
| Holdings [Text Block] | ||
| Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Intermediate Maturity New York Municipals Fund | |
| Class Name | Class C | |
| Trading Symbol | SINLX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at 877-6LM-FUND/656-3863 . | |
| Additional Information Phone Number | 877-6LM-FUND/656-3863 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of $10,000 investment Costs paid as a percentage of a $10,000 investment †, * Class C $70 1.39% | [4],[5] |
| Expenses Paid, Amount | $ 70 | |
| Expense Ratio, Percent | 1.39% | |
| Net Assets | $ 144,200,028 | |
| Holdings Count | $ / shares | 105 | [6] |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of May 31, 2024) Total Net Assets $144,200,028 Total Number of Portfolio Holdings * 105 Portfolio Turnover Rate 0% | [6] |
| Holdings [Text Block] | ||
| Class I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Intermediate Maturity New York Municipals Fund | |
| Class Name | Class I | |
| Trading Symbol | LMIIX | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at 877-6LM-FUND/656-3863 . | |
| Additional Information Phone Number | 877-6LM-FUND/656-3863 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of $10,000 investment Costs paid as a percentage of a $10,000 investment †, * Class I $27 0.54% | [7],[8] |
| Expenses Paid, Amount | $ 27 | |
| Expense Ratio, Percent | 0.54% | |
| Net Assets | $ 144,200,028 | |
| Holdings Count | $ / shares | 105 | [9] |
| Investment Company Portfolio Turnover | 0% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of May 31, 2024) Total Net Assets $144,200,028 Total Number of Portfolio Holdings * 105 Portfolio Turnover Rate 0% | [9] |
| Holdings [Text Block] | ||
| [1] * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased option contracts, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased option contracts, if any. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased option contracts, if any. | ||
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| Class A | Transportation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 33.60% |
| Class A | Special Tax Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.60% |
| Class A | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| Class A | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| Class A | Local General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| Class A | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| Class A | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| Class A | Pre-Refunded/Escrowed to Maturity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| Class A | Industrial Revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| Class A | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| Class A | Solid Waste/Resource Recovery [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class A | Leasing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class A | State General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class A | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| Class C | Transportation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 33.60% |
| Class C | Special Tax Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.60% |
| Class C | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| Class C | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| Class C | Local General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| Class C | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| Class C | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| Class C | Pre-Refunded/Escrowed to Maturity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| Class C | Industrial Revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| Class C | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| Class C | Solid Waste/Resource Recovery [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class C | Leasing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class C | State General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class C | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| Class I | Transportation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 33.60% |
| Class I | Special Tax Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.60% |
| Class I | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| Class I | Water & Sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| Class I | Local General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| Class I | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| Class I | Power [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| Class I | Pre-Refunded/Escrowed to Maturity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| Class I | Industrial Revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| Class I | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| Class I | Solid Waste/Resource Recovery [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class I | Leasing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class I | State General Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
